package com.hmdp.utils;

import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.BooleanUtil;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import java.util.Collections;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock{
    private String name;
    private StringRedisTemplate stringRedisTemplate;
    public SimpleRedisLock(String name, StringRedisTemplate stringredisTemplate) {
        this.name = name;
        this.stringRedisTemplate = stringredisTemplate;
    }
    private static final String KEY_PREFIX = "lock:";
    private static final String ID_PREFIX = UUID.randomUUID().toString() + "-";
    private static final DefaultRedisScript<Long> UNLOCK_SCRIPT = new DefaultRedisScript<>(
    );
    static {
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }
    @Override
    public boolean tryLock(Long timeSec) {
        // 获取线程标识
        String threadId = ID_PREFIX + Thread.currentThread().getId();
        // 获取
        Boolean isSuccess = stringRedisTemplate.opsForValue().setIfAbsent(KEY_PREFIX + name, threadId + "", timeSec, TimeUnit.SECONDS);
        return BooleanUtil.isTrue(isSuccess);
    }

    @Override
    public void unlock() {
        // 获取线程标识
        stringRedisTemplate.execute(UNLOCK_SCRIPT, Collections.singletonList(KEY_PREFIX + name),ID_PREFIX + Thread.currentThread().getId());

        //        String threadId = ID_PREFIX + Thread.currentThread().getId();
//        if (threadId.equals(stringRedisTemplate.opsForValue().get(KEY_PREFIX + name))) {
//            stringRedisTemplate.delete(KEY_PREFIX + name);
//        }

    }

}
